1343501 九、發明說明： 【發明所屬之技術領域】 本發明是關於一種複合式光學基板，特別是指一種同 時具有擴散及增亮功能之光學基板。 【先前技術】 在一般液晶顯示器的製造上，背光模組是一個可以產 生均勻增亮光源的零件，以直下式背光模組為例，其通常 是在一個框架上依序安裝一片反光片、數支燈管、一片擴 散板，以及至少一片具有聚光效果的增亮片，藉由擴散板 使透過的光源形成均勻的面光源。此種由擴散板及增亮片 組成的光學組件雖然可以產生預期的功效，但製造上必需 在兩者間塗佈黏膠，此不僅造成製作成本的增加，塗佈的 均勻度也會影響到光學特性，在設計上並不理想。 為了改善以上的缺失’在已知的技藝中有一種如圖置 所示的複合式光學基板1，上述光學基板1包含一位於下方 的擴散層11，以及一位於上方的增亮層12,其中該擴散層 11包括一個塑膠基質111，以及多數均勻分散在該基質U1 中的擴散粒子112’該基質ill具有一鄰近增亮層12的貼 合平面113，以及一與貼合平面in間隔的入光面114。該 增亮層12具有一與擴散層11貼合之貼合平面丨21，以及— 與该貼合平面121間隔並具有增亮功能的增亮表面I]〗。 為了製造以上所述的複合式光學基板丨，一般係在例如 聚碳酸酯（PC)或聚甲基丙烯酸甲酯等等的熔融基質ln中， 混合具有擴散效果之擴散粒子112，另外製備一種如聚甲義 5 1343501 丙稀酸甲醋之透明炫融原料備用。當該等炫融原料由模頭 起押出並堆叠時’再於透明炼融的材料上壓印出該增亮 表面122，即可形成如圖！所示的複合式光學基板卜 此種已知的複合式光學基板i與傳統兩層堆叠的結構 作比較’雖然具有製作成本降低，以及光學特性較佳的功 效，但是就擴散層11的結構而言，其擴散特性完全來自於 混合的擴散粒+ 112’亦即’藉由調整折射率不同於基質 111的擴散粒？ 112含量，來達到擴散光源的㈣，習知中 使用折射率差異為㈣心的擴散粒子，其添加漢度為 〜30%。此種結構之光學基板！中的擴散粒子112具有 較尚的成本’故其製造成本較高，而分佈在基質HI中的有 機或無機擴散粒子112也會吸收光能量’並降低光的穿透率 ’亦即，習知光學基板丨不僅材料成本高，亦無法兼顧良 好的擴散效果及穿透率，導致安裝之背光模組的均勾度及 輝度都較差。 【發明内容】 本發明之目的係在提供一種可降低製造成本，並可兼 顧光擴散效果及穿透率的複合式光學基板。 本發明之複合式光學基板包含：一擴散層，以及一與 擴散層接連的增亮層，上述擴散層包括一與該增亮層接連 之非平面擴散表面，以及一與擴散表面間隔之入光面，而 該增亮層I有-與該擴散表面間隔之增亮表φ。藉將擴散 層與增亮層接連一側設置成非平面結構的擴散表面可以 在具有相同擴散效果之同時，減少擴散粒子的使用量及製 6 1343501 造成本，同時亦可避免擴散粒子吸收過多的光能量，使^ 光學基板同時兼具有光擴散效果及高穿透率。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之較佳實施例的詳細說明中，將可清楚 的呈現。 參閱圖2,本發明複合式光學基板2之一較佳實施例包 含：一位於下方且透光的擴散層21，以及一位於上方的增 tc層22，其中該擴散層21係在一基質211中均勻摻雜有多 數擴散粒子212，上述基質2Π具有一位於下方且平坦的入 光面213,以及一位於上方並呈波浪造型的非平面形式之擴 散表面214。在製造上，該基質211可選自：聚甲基丙烯酸 甲醋（Polymethyl methacrylate，簡稱 PMMA)、聚碳酸 g旨 (Polycarbonate，簡稱PC)，或環烯烴聚合物（以丨…。丨⑷⑽ polymer，簡稱C0P)等，而該擴散粒子212 一般採用折射率 不同於基質211之有機或無機顆粒，亦即，只要能夠使光由 兩個折射率相異之介質中穿㉟，同時讓光線產生折射、反 射及散射等現象，並達到光學擴散效果者，皆適合用於本 發明。 本發明之增亮層22可選用透明之塑膠材料來成型，具 體例如：聚甲基丙烯酸甲酿（PMMA)、聚碳酸醋（pc)，或環 烤;^聚。物（(：()1>)等，上述增亮層22 #有—孤度與擴散層 21之擴散表面214配合之非平面形式的貼合表面221，以 及與該貼合表面221間隔並具有聚光效果的增亮表面222 7 1343501 ，在設計上該增亮表面222的形式並沒有特別的限制，其 可為實施例所揭*之菱形、结構，亦可為圓柱料等其他具 有增亮效果之任何設計。 製造時可採用雙色成型機一體成型該擴散層21及增亮 層22，亦可先利用模頭押出成型該擴散層21後再將例如 甲基丙烯酸"旨、聚石炭酸酯 <環烯烴聚合物等透明樹脂成 型在該擴散層21上，最後纽融材料上壓印出該增亮表面 222即可。1343501 IX. Description of the Invention: [Technical Field] The present invention relates to a composite optical substrate, and more particularly to an optical substrate having a diffusion and brightening function at the same time. [Prior Art] In the manufacture of a general liquid crystal display, the backlight module is a component that can generate a uniform brightening light source. For example, a direct-lit backlight module is generally used to sequentially mount a reflective sheet on a frame. The lamp tube, a diffusion plate, and at least one brightness enhancement plate having a concentrating effect, the diffused plate causes the transmitted light source to form a uniform surface light source. Although such an optical component composed of a diffusing plate and a brightness enhancing sheet can produce the intended effect, it is necessary to apply a glue between the two, which not only causes an increase in manufacturing cost, but also affects the uniformity of coating. Characteristics are not ideal in design. In order to improve the above-mentioned defects, there is a composite optical substrate 1 as shown in the prior art. The optical substrate 1 comprises a diffusion layer 11 located below, and a brightness enhancement layer 12 located above, wherein The diffusion layer 11 includes a plastic substrate 111, and a plurality of diffusion particles 112' uniformly dispersed in the substrate U1. The substrate ill has a bonding plane 113 adjacent to the brightness enhancing layer 12, and an entrance spaced apart from the bonding plane in. Glossy 114. The brightness enhancing layer 12 has a conforming plane 21 that is bonded to the diffusion layer 11, and a brightness-increasing surface I is spaced apart from the bonding plane 121 and has a brightness enhancing function. In order to manufacture the composite optical substrate 以上 described above, generally, in a molten matrix ln such as polycarbonate (PC) or polymethyl methacrylate, a diffusion particle 112 having a diffusion effect is mixed, and another preparation such as Polymethyst 5 1343501 Acetate methyl vinegar transparent raw materials for use. When the dazzling raw materials are pulled out from the die and stacked, the brightening surface 122 is embossed on the transparent smelting material to form a figure! The composite optical substrate shown is a comparison of the conventional composite optical substrate i with a conventional two-layer stacked structure. Although the manufacturing cost is lowered and the optical characteristics are better, the structure of the diffusion layer 11 is In other words, the diffusion characteristics are entirely derived from the mixed diffusion particles + 112', that is, by adjusting the diffusion particles having a refractive index different from that of the matrix 111. 112 content, to reach the diffusion source (four), the conventional use of the difference in refractive index is (four) the core of the diffusion particles, the added Han degree is ~ 30%. Optical substrate of this structure! The diffusion particles 112 have a relatively high cost, so the manufacturing cost thereof is high, and the organic or inorganic diffusion particles 112 distributed in the matrix HI also absorb the light energy 'and reduce the transmittance of light'. The optical substrate 丨 not only has high material cost, but also cannot achieve good diffusion effect and transmittance, resulting in poor hooking and brightness of the mounted backlight module. SUMMARY OF THE INVENTION An object of the present invention is to provide a composite optical substrate which can reduce the manufacturing cost and can simultaneously achieve a light diffusion effect and a transmittance. The composite optical substrate of the present invention comprises: a diffusion layer, and a brightness enhancement layer connected to the diffusion layer, the diffusion layer comprising a non-planar diffusion surface connected to the brightness enhancement layer, and a light incident from the diffusion surface The brightness enhancement layer I has a brightening table φ spaced from the diffusion surface. By using a diffusion surface with a non-planar structure on the side connecting the diffusion layer and the brightness enhancement layer, the same diffusion effect can be achieved, the amount of diffusion particles used can be reduced, and the production of 6 1343501 can be avoided, and the diffusion particles can be prevented from being absorbed too much. The light energy enables the optical substrate to have both light diffusion and high transmittance. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. Referring to FIG. 2, a preferred embodiment of the composite optical substrate 2 of the present invention comprises: a diffusion layer 21 located below and transparent, and an additional tc layer 22 located above, wherein the diffusion layer 21 is attached to a substrate 211. The plurality of diffusion particles 212 are uniformly doped, and the substrate 2 has a light-emitting surface 213 located below and flat, and a non-planar diffusion surface 214 located above and wavy. In terms of manufacture, the substrate 211 may be selected from the group consisting of: polymethyl methacrylate (PMMA), polycarbonate (PC), or a cyclic olefin polymer (by 丨.4(10)(10) polymer, Referred to as COP) and the like, the diffusion particles 212 generally use organic or inorganic particles having a refractive index different from that of the matrix 211, that is, as long as the light can be passed through the medium having two refractive indices different, and the light is refracted. Any phenomenon such as reflection and scattering, and achieving optical diffusion effects, is suitable for use in the present invention. The brightness enhancing layer 22 of the present invention may be formed by using a transparent plastic material such as polymethyl methacrylate (PMMA), polycarbonate (pc), or ring-baked; The (bright layer 22) has a non-planar bonding surface 221 that is coupled to the diffusion surface 214 of the diffusion layer 21, and is spaced apart from the bonding surface 221 and has The brightness-increasing surface of the concentrating effect is 222 7 1 343 501. The form of the brightness-increasing surface 222 is not particularly limited. It may be a diamond shape or a structure as disclosed in the embodiment, or may be brightened by other materials such as a cylindrical material. Any design of the effect. The diffusion layer 21 and the brightness enhancement layer 22 may be integrally formed by a two-color molding machine during manufacture, or the diffusion layer 21 may be extruded by a die first, and then, for example, methacrylic acid " A transparent resin such as an ester <cycloolefin polymer is formed on the diffusion layer 21, and the brightening surface 222 is embossed on the final fused material.
本發明第一較佳實施例所提供之複合式光學基板2，是 同時利用該擴散表® 214及擴散粒+ 212間的配合，來進 行光學擴散的動作’由於擴散表φ 214也具有光擴散效果 ，因此，在設計上’本發明之擴散層21的厚度可以較習知 者縮小。根據發明人的研究，在具有相同擴散效果的前提 下，圖1之光學基板1的擴散層丨丨厚度約為增亮層12的4 倍，但本發明第一較佳實施例之光學基板2的擴散層Μ厚 度，約為增亮層22的三分之一，即可達到相同的效果。上 述擴散層21的厚度介於〇.〗〜〗_ ’而該擴散粒子2丨2的使 用量為0.01〜10重量％。 本發明擴散層21厚度的縮小’可以有效降低製造成本 較高之擴散粒+ 2i2的使用量’以期進一步地降低該複合 式光㈣2的製造成本。除此之外，一般擴散粒子212 會吸收光能量進而降低光的穿透率，而本發明利用位在擴 散層21及增亮層22間的擴散表面214來提高擴散效果， 除了可以降低擴散粒子 212之使用量外，亦可改善擴散粒 8 1343501 子212所造成光穿透率低的缺失，並因此提升安裝本發明 之光學基板2的背光模組的均勻度及輝度。The composite optical substrate 2 according to the first preferred embodiment of the present invention is an optical diffusion operation using the combination of the diffusion table® 214 and the diffusion particles + 212. The diffusion table φ 214 also has light diffusion. The effect, therefore, can be reduced in design by the thickness of the diffusion layer 21 of the present invention. According to the research of the inventors, the diffusion layer thickness of the optical substrate 1 of FIG. 1 is about 4 times that of the brightness enhancement layer 12, but the optical substrate 2 of the first preferred embodiment of the present invention has the same diffusion effect. The thickness of the diffusion layer is about one third of the brightness enhancement layer 22, and the same effect can be achieved. The thickness of the diffusion layer 21 is 〇. 〗 〖 ‘ and the amount of the diffusion particles 2 丨 2 is 0.01 to 10% by weight. The reduction of the thickness of the diffusion layer 21 of the present invention can effectively reduce the use amount of the diffusion particles + 2i2 which is relatively high in manufacturing cost, in order to further reduce the manufacturing cost of the composite light (4) 2. In addition, generally, the diffusion particles 212 absorb the light energy and thereby reduce the transmittance of the light, and the present invention utilizes the diffusion surface 214 between the diffusion layer 21 and the brightness enhancement layer 22 to improve the diffusion effect, in addition to reducing the diffusion particles. In addition to the amount of use of 212, the loss of light transmittance caused by the diffusion particles 8 1343501 212 can be improved, and thus the uniformity and luminance of the backlight module on which the optical substrate 2 of the present invention is mounted can be improved.
茶閱圖3 ’本發明複合式光學基板2之第二較佳實施例 亦包含：-位於下方的_ 2卜以及一位於該擴散層21 上方且厚度約為擴散層21之三倍的增亮層22，纟中該擴散 層2】亦具有-位於下方的人光面213，以及—與該增亮層 22接連之非平面形式的擴散表面214,本實施例盥第一實 施例之差別在於：該擴散表φ 214係由多數半圓形凹緣所 成ΌΡ在本發明中，該擴散表面2 i 4的形式並沒有 特别的限制’其可為第一實施例所揭示之波浪凹凸外，亦 可為半圓弧形、稜鏡面、圓柱面或正弦波⑷㈣叫面具有 擴散光源效果的其他不同形式。FIG. 3 'The second preferred embodiment of the composite optical substrate 2 of the present invention also includes: - a lower portion _ 2 b and a brightening layer located above the diffusion layer 21 and having a thickness approximately three times that of the diffusion layer 21 The layer 22, the diffusion layer 2 in the crucible, also has a human light surface 213 located below, and a non-planar diffusion surface 214 connected to the brightness enhancement layer 22, the difference between the first embodiment and the embodiment is that The diffusion table φ 214 is formed by a plurality of semicircular concave edges. The form of the diffusion surface 2 i 4 is not particularly limited. It may be other than the wavy irregularities disclosed in the first embodiment. It can also be a semi-circular, 稜鏡, cylindrical or sine wave (4) (4) called surface with other different forms of diffused light source effect.
參閱圖4’本發明複合式光學基板2之第三較佳實施例 亦包含.一位於下方之擴散層21，以及一位在該擴散層h 上方之增亮層22，其中該擴散層21具有一與增亮層22接 連之擴散表面214,以及一位於下方之入光面213，本實施 例與第一實施例的差別在於：該入光面213為一凹凸並且 有擴散功能的結構，藉在擴散層21上設置兩個具有擴散效 果之，散表面214及入光面213，可以在減少擴散粒子212 使用罝的情況下，達到更佳的擴散效果。 由以上說明可知，本發明直接利用押出技術或雙色射 出成型機來製造一體連結之複合式光學基板2,並於擴散層 上又置郧近增凴層22之非平面擴散表面214的構造，不 僅未見於習知光學基板，前述設計更可因為擴散表面214 9 1343501 -· 的設計，而減少擴散粒子212的使用量。亦即，在相同擴 r 散效果的前提下’本發明只要使用少量的擴散粒子212就 可以達到相同的擴散效果，由於擴散粒子212具有較高的 製造成本，故本發明該項設計可以降低光學基板2之製造 成本。在此同時，降低擴散粒子212的使用量，也可以改 善擴散粒子212吸收光能量、降低穿透率等缺失，使本發 明光學基板2可以兼具光擴散效果及高穿透率，並因此提 • 升女裝该光學基板2之背光模組的均勻度及輝度。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾皆仍 . 屬本發明專利涵蓋之範圍内。 • 【圖式簡單說明】 圖1疋一種習知複合式光學基板的剖視放大圖； 圖2是本發明光學基板之第一較佳實施例的剖視放大 圖； 圖3是本發明光學基板之第二較佳實施例的剖視放大 圖；及 1 圖4是本發明光學基板之第三較佳實施例的剖視放大 圖0 10 1343501 【主要元件符號說明】 2 光學基板 214 21 擴散層 22 211 基質 221 212 擴散粒子 222 213 入光面 擴散表面 增亮層 貼合表面 增亮表面Referring to FIG. 4, a third preferred embodiment of the composite optical substrate 2 of the present invention also includes a diffusion layer 21 located below, and a brightness enhancement layer 22 over the diffusion layer h, wherein the diffusion layer 21 has A diffusing surface 214 connected to the brightness enhancing layer 22 and a light incident surface 213 located below, the difference between the embodiment and the first embodiment is that the light incident surface 213 is a concave and convex structure having a diffusion function. Providing two diffusing surfaces 214 and a light incident surface 213 on the diffusion layer 21 can achieve a better diffusion effect by reducing the use of germanium by the diffusion particles 212. As apparent from the above description, the present invention directly uses the extrusion technique or the two-color injection molding machine to manufacture the integrally-coupled composite optical substrate 2, and the structure of the non-planar diffusion surface 214 of the augmented layer 22 is placed on the diffusion layer, not only Not seen in conventional optical substrates, the foregoing design can reduce the amount of diffusion particles 212 used due to the design of the diffusion surface 214 9 1 343 501. That is, under the premise of the same effect of expanding the dispersion, the present invention can achieve the same diffusion effect by using a small amount of the diffusion particles 212. Since the diffusion particles 212 have a high manufacturing cost, the design of the present invention can reduce the optical efficiency. The manufacturing cost of the substrate 2. At the same time, by reducing the amount of the diffusion particles 212 used, it is also possible to improve the absorption of light energy by the diffusion particles 212 and to reduce the loss of transmittance, etc., so that the optical substrate 2 of the present invention can have both a light diffusion effect and a high transmittance, and thus • The uniformity and brightness of the backlight module of the optical substrate 2. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are all Still within the scope of the patent of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional enlarged view of a conventional composite optical substrate; FIG. 2 is a cross-sectional enlarged view of a first preferred embodiment of the optical substrate of the present invention; FIG. 3 is an optical substrate of the present invention. 2 is a cross-sectional enlarged view of a third preferred embodiment of the optical substrate of the present invention. 0 10 1343501 [Major component symbol description] 2 Optical substrate 214 21 Diffusion layer 22 211 Substrate 221 212 Diffusion Particles 222 213 Into the light surface diffusion surface Brightening layer Fit surface Brightening surface